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(cherry picked from commit 04ea1375c55aa67df4e7fc61dbb534111767f3b6)
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On recent Debian, /etc/blkid.tab is now a symlink to /dev/.blkid.tab.
Rather than chasing the cache file around (it may move to /run in future)
use the -c /dev/null option to stop blkid from reading the cache.
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If the blkid command returns 2, that means the value was not found.
Note that this changes the output of the vfs-type API when the
filesystem has no type (eg when it is empty). Previously this would
return an error. Now it returns empty string "".
We did not document this either way. Making it return empty string is
consistent with vfs-label and vfs-uuid.
This change broke list-filesystems, since that code was assuming that
vfs-type could only return a filesystem type or an error.
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Remove both possible cache locations.
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These APIs generalize the existing 'get-e2label' and 'get-e2uuid'
calls, to provide calls which should be able to get the label
and UUID for most filesystem types. These use 'blkid' to do the
work.
I have tested that the blkid commands themselves work on RHEL 5.
(Suggested by Yufang Zhang).
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By killing the cache file, we make blkid work in situations such
as a just-created filesystem.
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Note that there is no change to the semantics of the code.
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Change the appliance so PATH includes common directories. Thus
we don't need to hard-code paths to binaries (eg. "/sbin/fdisk")
everywhere.
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The RPC stubs already prefix the command name to error messages.
The daemon doesn't have to do this. As a (small) benefit this also
makes the daemon slightly smaller.
Code in the daemon such as:
if (argv[0] == NULL) {
reply_with_error ("passed an empty list");
return NULL;
}
now results in error messages like this:
><fs> command ""
libguestfs: error: command: passed an empty list
(whereas previously you would have seen ..command: command:..)
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